All classes/functions and components in the specified module/route should be unit tested. See here for an example test in our webapp which also uses react: [https://github.com/Integreat/integreat-webapp/blob/master/src/modules/common/containers/tests/Helmet.spec.js]

The only difference from react-native to react-dom is that you can NOT use enzyme. Therefore we decided to use [https://github.com/callstack/react-native-testing-library]

You can always check the webapp if you are not sure how you should test something: [https://github.com/Integreat/integreat-webapp/tree/master/src]